Have you heard of Stephen Krashen's Input Hypothesis? [1] There are a couple of parts to it but it essentially says that linguistic competence (a fancy way to say your innate knowledge of a language) only increases when you take in input. If you talk all day that doesn't really make you any better (since you don't learn anything new) unless you use a process like deliberate feedback to be corrected. Personally I think it's much more useful to thus focus on reading/listening to start and then later move on to speaking/writing. I learned Spanish through normal school and while I can speak fast the fact that I haven't had much real input really shows since I'm generally just translating English -> spanish and I don't know if I'm using grammar right since I haven't heard it enough.
[1] https://en.wikipedia.org/wiki/Input_hypothesis